f(x) = x+7 g(x) = x pangkat 2 + 5x - 4 Tentukan : A. (f o g)(x) B. (g o f)(x)

f(x) = x+7
g(x) = x² + 5x - 4
A. (fog)(x)
=x+7
=(x²+5x-4)+7
=x²+5x+3

B. (gof)(x)
=x²+5x-4
=(x+7)²+5(x+7)-4
=x²+14x+49+5x+35-4
=x²+19x+80